On Sunday, the North's Korean Central News Agency (KCNA) reported that Pyongyang had "successfully" tested the launch of a new type of tactical guided weapon, with Kim Jung-un observing the test.
The agency added that "the new tactical guided weapons system is of great importance in improving the firepower of long-range artillery units on the front lines, and enhancing the efficiency in operating nuclear weapons."
Explaining the long-term plan of the Party Central Committee to boost the country's defense capabilities, the North Korean leader gave instructions on further building the country's defense capabilities and nuclear combat forces.
The North Korean leader praised the national defense scientific research sector for its continuous success in achieving the war deterrent goals set by the 8th Congress of the Workers' Party last year.
The agency did not give further details about the specifications of the tested weapon.
The South Korean Joint Chiefs of Staff said in a statement that it "detected North Korea's launch of two missiles towards the East Sea at 6:00 pm Saturday local time (9:00 GMT), according to the local "Yonhap" agency.
It was added that "the two missiles traveled about 110 km, at an altitude of about 25 km, and at a maximum speed of less than Mach 4."
The statement stressed that "South Korean and US intelligence authorities are closely monitoring North Korea's movements for the additional launch, while preparing and maintaining a strong defensive stance."
Observers in the south believe that Pyongyang has tested an upgraded "KN-23" missile.